.container-appbar {
    overflow: visible;
}
body {
    padding: 0;
    margin: 0;
    font-family: Roboto,Helvetica Neue,Helvetica,Arial,Microsoft Yahei,Hiragino Sans GB,Heiti SC,WenQuanYi Micro Hei,sans-serif;
    line-height: 1.6;
    color: #3c5675;
}
.container {
    max-width: 1040px;
    margin: 0 auto;
    overflow: hidden;
    padding: 0 16px;
    box-sizing: border-box;
}
.container-appbar {
    overflow: visible;
}
.appbar{
            height: 64px;
            display: flex;
            align-items: center;
}
.appbar .logo {
    display: flex;
    align-items: center;
    height: 100%;
    color: #1a73e8;
    text-decoration: none;
    font-size: 22px;
}

.appbar .spacer {
    flex-grow: 1;
}
.appbar .dropdown {
    padding: 0;
    margin: 0;
}
.appbar .item:last-child {
    margin-right: 0;
}
.appbar .item, .appbar .dropdown > a {
    position: relative;
    display: flex;
    align-items: center;
    height: 100%;
    font-size: 16px;
    padding: 0 6px;
    margin: 0 4px;
}
.appbar .dropdown {
    padding: 0;
    margin: 0;
}
.appbar .dropdown > a {
    position: relative;
    padding-right: 14px;
    margin-right: 8px;
}
.appbar .item, .appbar .dropdown > a {
    position: relative;
    display: flex;
    align-items: center;
    height: 100%;
    font-size: 16px;
    padding: 0 6px;
    margin: 0 4px;
}
.appbar .dropdown:hover .dropdown-content {
    display: block;
}
.appbar .dropdown:last-child .dropdown-content {
    right: 0;
}
.appbar .dropdown-content {
    position: absolute;
    top: 64px;
    box-shadow: 0 5px 5px -3px rgba(0,0,0,.2), 0 8px 10px 1px rgba(0,0,0,.14), 0 3px 14px 2px rgba(0,0,0,.12);
    padding: 8px 0;
    border-radius: 4px;
    display: none;
    background-color: #fff;
    z-index: 99;
}
.appbar .dropdown-content a:hover {
    background-color: #eee;
}
.appbar .dropdown-content a {
    display: block;
    padding: 0 16px;
    height: 48px;
    line-height: 48px;
    white-space: nowrap;
}
.appbar .dropdown > a:after {
    content: "";
    border-color: #666 #fff #fff;
    border-style: solid;
    border-width: 4px;
    top: 48%;
    right: 0;
    margin-left: 3px;
}
.container {
    max-width: 1040px;
    margin: 0 auto;
    overflow: hidden;
    padding: 0 16px;
    box-sizing: border-box;
}
.banner h1 {
    font-size: 32px;
    font-weight: normal;
    margin: 0 0 24px 0;
}
.banner .meta {
    font-size: 20px;
    opacity: .76;
    max-width: 80%;
    margin: 0 auto 48px auto;
}
.banner {
    text-align: center;
    padding-top: 96px;
    padding-bottom: 82px;
}
.banner .actions a {
    margin-right: 8px;
    margin-left: 8px;
}

.btn-large {
    height: 46px;
    line-height: 46px;
    font-size: 20px;
    padding: 0 24px;
}
.btn {
    position: relative;
    display: inline-block;
    box-sizing: border-box;
    height: 36px;
    margin: 0;
    padding: 0 16px;
    overflow: hidden;
    font-weight: 500;
    line-height: 34px;
    letter-spacing: 0.04em;
    white-space: nowrap;
    text-align: center;
    text-decoration: none;
    vertical-align: middle;
    background: transparent;
    font-size: 14px;
    border: 1px solid #1a73e8;
    color: #1a73e8;
    border-radius: 4px;
    outline: none;
    cursor: pointer;
    transition: all .2s, box-shadow .2s;
    user-select: none;
    touch-action: manipulation;
    will-change: box-shadow;
    zoom: 1;
    -webkit-user-drag: none;
}
.feature {
    background-image: linear-gradient(180deg, #eff2f6 0, rgba(239,242,246,0) 220px);
    padding: 56px 0 80px 0;
}
.material .container {
    padding-bottom: 8px;
    margin-bottom: -8px;
}
.container {
    max-width: 1040px;
    margin: 0 auto;
    overflow: hidden;
    padding: 0 16px;
    box-sizing: border-box;
}
.feature h2 {
    color: #1a73e8;
    font-weight: normal;
    font-size: 32px;
    text-align: center;
    margin: 0;
}
.feature .meta {
    font-size: 20px;
    max-width: 60%;
    margin: 16px auto 56px auto;
    text-align: center;
}
.material .cover {
    background-image: url(https://cdn.w3cbus.com/mdclub.org/static/images/light/material.png!webp);
    background-size: cover;
    width: 100%;
    height: 0;
    padding-bottom: 39.26%;
    border-radius: 4px;
}
.shadow {
    box-shadow: 0 0 2px 0 rgba(60,64,67,.3), 0 0 3px 1px rgba(60,64,67,.15);
}